Choose a Target Function cont.

• V(b) = 100, if b is a final board state that is
  won
  V(b) = -100, if B is a final board state that
  is lost
  V(b) = 0, if b is a final board state that is
  a draw
  V(b) = V( ), if b is not a final state where
  is the best final board state starting
  from b assuming both players play optimally
• Not computable!! - nonoperational definition (changes over time!!! - Deep Blue)
• Need Operational V - What are Realistic Time Bounds??
• May be difficult to learn an operational form of V perfectly - Function Approximation .